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Three phase voltage drop

For a balanced 3 phase system the supply authority, distributes 400v at the supply transformer.

The supply cables are 150m in length, so care is required to ensure the voltage drop does not become excessive at the customers terminals

Assuming there is a votage drop of 20v, across each cable at a particular balanced load, what voltage would the customer see at his terminals ?

I presume 360v ?

Regards, Derek

Parents
  • The volt drop won't be 20+20 = 40 volts because the voltages aren't in phase......

    Are we talking a STAR balanced load or a DELTA balance load?

Reply
  • The volt drop won't be 20+20 = 40 volts because the voltages aren't in phase......

    Are we talking a STAR balanced load or a DELTA balance load?

Children
  • The site is a large waste water works and needs both 400v and 230v at various points around the site, so it is STAR.